#include <stdio.h>
void get_s(int* a, int* b)
{
	int z = 0;
	z = *a;
	*a = *b;
	*b = z;
}
int main()
{
	int a = 10;
	int b = 20;
	get_s(&a, &b);
		printf("%d\n%d", a, b);
	return 0;
}